title: Synthesis and photoluminescent properties of (La,Ca)₃Si₆N₁₁:Ce³+ fine powder phosphors for solid-state lighting.
abstract: We have developed a new Ce(3+)-activated nitride phosphor, (La,Ca)(3)Si(6)N(11):Ce(3+), using the gas-reduction-nitridation method. The synthesized (La,Ca)(3)Si(6)N(11):Ce(3+) possesses tunable yellow broadband emission with the dominant wavelength of 577-581 nm and the external quantum efficiency up to ∼42%, under an excitation of 450 nm. Precise steady-state and time-resolved photoluminescence analyses revealed that the only one type of Ce(3+) center is active under the blue-light excitation. By combining the synthesized (La,Ca)(3)Si(6)N(11):Ce(3+) phosphors with the 450-nm InGaN chip, a broad range of white light with the correlated color temperatures of ∼2600-3800 K can be created, demonstrating their promising applicability to the warm-white light-emitting diodes.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. suehiro@tagen.tohoku.ac.jp
authors.forename: Takayuki
authors.initials: T
authors.lastname: Suehiro
authors.forename: Naoto
authors.initials: N
authors.lastname: Hirosaki
authors.forename: Rong-Jun
authors.initials: RJ
authors.lastname: Xie
mesh_terms: D002586:Cesium / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D008163:Luminescent Measurements / Q000295:instrumentation*; D011208:Powders; D012666:Semiconductors
chemical_list: D011208:Powders; D002586:Cesium